Handheld GPS units are available as inexpensive units that provide only basic information, such as latitude/longitude and saving waypoints, or as more feature-rich devices that include chartplotters, routes and tracking, complete nautical chart data, and many other features.
We chose the Garmin Oregon 400C. Its touchscreen display is large and easy to read, and the funtions are so intuitive that you almost don't need a manual. Read our review of the Garmin Oregon 400c.